How do you apply a gloss and spec map on one cycles material?
I used the 4 images on their pricing page in my demo.

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The Albedo Map goes in to the Diffuse node as the base color.
The Specular Map goes in to the Glossy node as the specular color. (metals are one of the few materials that have a colored specular highlight.)
The Gloss Map is used as the mix factor in the Mix Shader node between the diffuse and the glossy.
The Normal Map get plugged in to a Normal Map node then connected to both the diffuse and the glossy nodes.